Sending IPv6 RAs only from VRRP address.

I have two MLX-4 providing Internet access in an office building. Each VLAN is configured on both machines and VRRP-Extended is used on VLANs' VEs to provide IPv4 default gateway address. I hoped to use a similar approach for IPv6, that is to provide a VRRP-Extended based gateway address (fe80::1). Unfortunately both NetIrons send Router Advertisements both for their own link-local IPv6 address and the shared gateway. This way a client's computer receives 3 default routes and as seen in tcpdump output sends traffic directly to one of NetIrons (I've checked target MAC address) instead of the shared gateway.

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